What the two debug logs show is:
From CC's point of view:
- CC thinks calibre went away after the FREE_SPACE command.
- CC never received the SET_LIBRARY_INFO command
From calibre's point of view:
- Calibre received CC's response to the FREE_SPACE command.
- Calibre sent the SET_LIBRARY_INFO command
- calibre waited 5 minutes for an answer that never arrived.
This is strange. What it looks like is that some security SW decided that the conversation was "evil" and blocked further packets, in particular the outgoing SET_LIBRARY_INFO command packet. Is this something that could happen on Mint?